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Roasting Furnae..

Patented Jan. 27,1880..

NAFETERS. PHOTO-LITIIOGRAPHER, WASHINGTON. DC.

Nrrn STATES PATENT muon.

HALF OF PRIERE, OF SAME PLACE.

HIS RIGHT TO JAMES WHITE AND WILLIAM GEORGE LEM- oRE-ROASTING FURNACE.

SPECIFICATION forming part of Letters Patent No. 223,850, dated January 27, 1880. Application filed October 12, 1878.

To all whom t may concern Beit known that I, HENRI HERRENSCHMIDT, of Melbourne, in the Colony of Victoria, civil engineer, have invented new and useful Im- 5 provcments in Furnaces for Roasting Orcs, which improvements are fully set forth in the following specification, reference being had to the accompanying drawings.

This invention consists, mainly, in the comro bination, in a furnace, of a revolving tapering port-ion with a removable nre-chamber, as will be fully described hereinafter.

The roasting-chamber is set horizontally,

the feed being at the smaller end and the discharge at the larger end. The fire-place is at the latter end, and the chimney-stack at the former end.

In a forty-feet chamber the largerend should be about two feet more in diameter than the 2o smaller end. The said chamber revolves on frictionrollers supported on suitable piers. The material is fed through an inclined chute. Allowance must be made in the brick-work for the expansion of the roasting chamber h2 5 by heat. The said chamber may be divided into` two or more longitudinal compartments, and the outer casing may be triangular, square, or polygonal. Passages are provided for the admission of air to either the upper or lower halfA of the said chamber. When the material requires to be treated with hydrogen gas, the divisions must extend the whole length of the chamber and terminate in separate ascendin lines.

The fireplace is carried on wheels running on rails, to admit of its easy removal in the event of its becoming necessary to obtain access to the body of the roasting-chamber, or to substitute one with a hydrogen-gas generator for a fire-place without one,or vice versa.

The revolving motion is very slow-say one revolution in five minutes-and it maybe either continuous or intermittent, the object being to subject the material under treatment to the action of heat and atmospheric air or heat and hydrogen gas alternately.

Referring to the drawings hereto attached, Figure l shows a longitudinal section of a furnace constructed according to this invention,

in which only two longitudinal compartments 5o are made in the roasting-chamber, this being the number I prefer. Fig. 2 shows a crosssection thereof. Fig. 3 shows the same roasting-chamber, but with a hydrogengas generator over the ure-place, so as to supply hydro- 5 5 gen when required instead of atmospheric air. Fig. 4 shows a cross-section thereof. Figs.

5 and 6"show cross-sections of other tapering tubular roasting chambers with more than two longitudinal compartments, being modii- 6o cations of my invention.

A-is the longitudinal division, which consists of two concave surfaces, the crown of each meeting that of the other, while the end of space B is provided with ahead consisting of an iron plate, by means of which communication with the space is cut off, so that it cannot serve as a passage for the heated air or gas. This division is made of brick or brick-earth, and is supported by wrought-iron plates or 7o backing B', which are pressed against the back of said division-walls by means of wedges' B2, screwed tight. Air-holes are left at intervals to cool these wedges and plates.

C is the fire-place, and D the opening for the `entrance of the atmospheric air. These also act as sight-holes.

E is the feeding chute or hopper. The roof of the lire-place must be built on a level with the division, so as to compel the 8o heat to pass through that half of the revolving roasting-cham ber which for the time being is the lower, although, of course, either conlpartment can be made the heating one at Ypleasure by revolving the roasting-chamber.

In Fig. 3, F is the hydrogen-gas generator. In any case the lire-place is made removable, as shown.

The mode `of operation is as follows: The material to be treated is supplied through the 9o chute E, the atmospheric air holes D opened, and the fire lighted in the tire-place O. The roasting-chamber is then slowly revolved at a regular speed or by a constant succession of partial revolutions, or it may vary in speed v9 5 during each revolution, moving very slowly so long as the compartments are fairly exposed to the action oi'- the heat, atmosphere, or by drogen, as the Acase may be, and traveling much quicker from one-position to the other, or it may stop altogether while being thus eX- posed, so as to make it an intermittent motion. When the'inaterial reaches the commencement of the divisions A it distributes itselfl between the two compartments, part entering one half and part entering the other halt' of the chamber, each half being alternately the upper and lower one respectively. Whichever is the upper one has its contents exposed to the action of the atmosphere. During the process of revolution,- hoWever, both compartments are at times exposed tothe heat ofthe furnace.

When treating sulphurets, which are difficult to roast and easy to smelt, such as antimony sulphuret, l use a fire -place With hydrogengas generator7 as shown in Fig. 3. I produce the gas by means of steam admitted into the retort F, containing iron7 the result of Which i's (as is Well-known) the retention of the oxygen of the steam by the iron, aud the setting free of the hydrogen. This is then conducted into the upper half of the revolving roasting chamber, the atmospheric-air entrances D having been previously closed. It

is obvious that the hydrogen might be con- H. HERRENSGHMIDT.

Witnesses EDWD. WATERS, W. S. BAYs'roN. 

